Lipoma is the second most common benign tumor of the colon after adenomas. 脂肪瘤是結腸中僅次于腺瘤的第二位最常見(jiàn)的良性腫瘤。
Metanephric adenoma is a unique renal tumor with benign biologic behavior in spite of their large size. 后腎腺瘤盡管體積較大,但卻為胚胎發(fā)育過(guò)程中后腎來(lái)源的良性腫瘤,較少見(jiàn)。